Added functionality for testing with config files.

tests/step_defs/test_server_start.py

@@ -10,10 +10,10 @@ def create_server():
     """Set up a server."""
 
 
-@given("it is not using localhost")
-def set_server_address(server):
-    """Sets tthe server to not use localhost."""
-    server.set_to_host_ip()
+@given("environment variables are used")
+def set_use_environment(server):
+    """Sets up the process for environment variables."""
+    server.use_config = False
 
 
 @given("port is changed to something different")
@@ -31,7 +31,7 @@ def start_server(server):
 @when("the home page is accessed")
 def access_home_page(server, page):
     """Access the home page."""
-    url = f"http://{server.address}:{server.port}/"
+    url = f"http://{server.base_url}/"
     page.request_url(url)